Файл: vendor/intervention/gif/src/Decoders/AbstractPackedBitDecoder.php
Строк: 41
<?php
declare(strict_types=1);
namespace InterventionGifDecoders;
abstract class AbstractPackedBitDecoder extends AbstractDecoder
{
/**
* Decode packed byte
*
* @return int
*/
protected function decodePackedByte(string $byte): int
{
return unpack('C', $byte)[1];
}
/**
* Determine if packed bit is set
*
* @param int $num from left to right, starting with 0
* @return bool
*/
protected function hasPackedBit(string $byte, int $num): bool
{
return (bool) $this->getPackedBits($byte)[$num];
}
/**
* Get packed bits
*
* @param int $start
* @param int $length
* @return string
*/
protected function getPackedBits(string $byte, int $start = 0, int $length = 8): string
{
$bits = str_pad(decbin($this->decodePackedByte($byte)), 8, '0', STR_PAD_LEFT);
return substr($bits, $start, $length);
}
}